Neutron ML2 plugin introduces the first extension driver port_security, this patch add it to be a default extension driver as a example. And also, if not set it by default, networks like public/private which are created after the neutron-db-manage's update, will not include the port-sec value. Change-Id: I3035317c83d22804855517434bd8578719ce0436 Partially Implements: blueprint ml2-ovs-portsecurity
Neutron plugin specific files
Neutron plugins require plugin specific behavior.
The files under the directory, lib/neutron_plugins/, will be used
when their service is enabled.
Each plugin has lib/neutron_plugins/$Q_PLUGIN and define the following
functions.
Plugin specific configuration variables should be in this file.
- filename: 
$Q_PLUGIN- The corresponding file name MUST be the same to plugin name 
$Q_PLUGIN. Plugin specific configuration variables should be in this file. 
 - The corresponding file name MUST be the same to plugin name 
 
functions
lib/neutron-legacy calls the following functions when the $Q_PLUGIN is enabled
neutron_plugin_create_nova_conf: setNOVA_VIF_DRIVERand optionally set options in nova_conf e.g. NOVA_VIF_DRIVER=${NOVA_VIF_DRIVER:-"nova.virt.libvirt.vif.LibvirtGenericVIFDriver"}neutron_plugin_install_agent_packages: install packages that is specific to plugin agent e.g. install_package bridge-utilsneutron_plugin_configure_common: set plugin-specific variables,Q_PLUGIN_CONF_PATH,Q_PLUGIN_CONF_FILENAME,Q_PLUGIN_CLASSneutron_plugin_configure_debug_commandneutron_plugin_configure_dhcp_agentneutron_plugin_configure_l3_agentneutron_plugin_configure_plugin_agentneutron_plugin_configure_serviceneutron_plugin_setup_interface_driverhas_neutron_plugin_security_group: return 0 if the plugin support neutron security group otherwise return 1neutron_plugin_check_adv_test_requirements: return 0 if requirements are satisfied otherwise return 1